Resource coordination for half duplex communications
Methods, systems, and devices for wireless communications are described that provide for resource allocation in an integrated access and backhaul (IAB) network. A relay node in an IAB network may be assigned a first resource partition that is different from a second resource partition for the child and parent nodes. Based on a resource configuration (e.g., for a slot) of the second resource partition, the relay node may opportunistically utilize the second resource partition for communications. For instance, the relay node may determine a direction table based on the resource configurations of the child and parent nodes, which may be used to perform uplink or downlink communications in one or more symbols of the second resource partition. The relay node may also identify flexible symbols as free or non-free when determining the direction table.
1. A method for wireless communications at a relay device in communication with a parent network node and a child network node, comprising:
identifying a set of resources partitioned into a first subset of resources for the relay device and a second subset of resources for the parent network node and the child network node;
receiving, from an anchor node, an indication of a direction table for a slot of the second subset of resources, wherein the direction table is based at least in part on respective slot structures for the parent network node and the child network node, and wherein the direction table indicates a functionality of the relay device for communications scheduled by the relay device during the slot of the second subset of resources;
scheduling communications in the slot of the second subset of resources based at least in part on the direction table; and
communicating with one or more devices during the slot of the second subset of resources according to the scheduled communications.
2. The method of claim 1 , further comprising:
determining a slot structure for the relay device, the slot structure associated with the slot of the second subset of resources;
exchanging, with the parent network node or the child network node, slot structure information comprising the slot structure; and
determining the direction table for the slot of the second subset of resources based at least in part on exchanging the slot structure information.
3. The method of claim 2 , wherein exchanging the slot structure information comprises:
transmitting an indication of the slot structure for the relay device; and
receiving, from at least one of the parent network node or the child network node, an additional slot structure for the parent network node, the child network node, or both.
4. The method of claim 1 , further comprising:
determining one or more symbols of the slot are available for communications; and
transmitting, to one or more other devices, a message indicating the one or more symbols are available.
5. The method of claim 4 , wherein determining the one or more symbols of the slot are available for communications comprises:
determining the one or more symbols of the slot are unused for a threshold duration.
6. The method of claim 1 , further comprising:
identifying a slot structure for a second slot of the first subset of resources, wherein the slot structure indicates a set of flexible symbols;
dividing the set of flexible symbols into a set of free flexible symbols and a set of non-free flexible symbols; and
transmitting an indication of the set of free flexible symbols to the child network node.
7. The method of claim 1 , further comprising:
receiving a control message comprising the indication of the direction table.
8. The method of claim 1 , further comprising:
receiving, from the child network node, a resource configuration for the slot of the second subset of resources; and
scheduling communications in the slot of the second subset of resources based at least in part on the resource configuration.
9. A method for wireless communications at an anchor node, comprising:
identifying a set of resources partitioned into a first subset of resources for a relay device and a second subset of resources for a parent network node and a child network node, wherein the parent network node and the child network node are in communication with the relay device;
determining respective slot structures for the parent network node and the child network node, the respective slot structures associated with a slot of the second subset of resources; and
transmitting, to the relay device, an indication of a direction table for the relay device for the slot of the second subset of resources, wherein the direction table is based at least in part on the respective slot structures for the parent network node and the child network node, and wherein the direction table indicates a functionality of the relay device for communications scheduled by the relay device during the slot of the second subset of resources.
10. The method of claim 9 , further comprising:
transmitting a control message comprising the indication of the direction table and scheduling information for communications during the slot.
11. The method of claim 9 , wherein the respective slot structures are enhanced slot structures comprising an indication of a resource type for each symbol in the slot.
12. A relay device for wireless communications with a parent network node and a child network node, comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and operable to execute the code to cause the relay device to:
identify a set of resources partitioned into a first subset of resources for the relay device and a second subset of resources for the parent network node and the child network node;
receive, from an anchor node, an indication of a direction table for the relay device for a slot of the second subset of resources, wherein the direction table is based at least in part on respective slot structures for the parent network node and the child network node, and wherein the direction table indicates a functionality of the relay device for communications scheduled by the relay device during the slot of the second subset of resources;
schedule communications in the slot of the second subset of resources based at least in part on the direction table; and
communicate with one or more devices during the slot of the second subset of resources according to the scheduled communications.
13. The relay device of claim 12 , wherein the one or more processors are operable to cause the relay device to:
determine a slot structure for the relay device, the slot structure associated with the slot of the second subset of resources;
exchange, with the parent network node or the child network node, slot structure information comprising the slot structure; and
determine the direction table for the slot of the second subset of resources based at least in part on exchanging the slot structure information.
14. The relay device of claim 13 , wherein, to exchange the slot structure information, the one or more processors are operable to cause the relay device to:
transmit an indication of the slot structure for the relay device; and
receive, from at least one of the parent network node or the child network node, an additional slot structure for the parent network node, the child network node, or both.
15. The relay device of claim 12 , wherein the one or more processors are operable to cause the relay device to:
determine one or more symbols of the slot are available for communications; and
transmit, to one or more other devices, a message indicating the one or more symbols are available.
16. The relay device of claim 15 , wherein, to determine the one or more symbols of the slot are available for communications, the one or more processors are operable to cause the relay device to:
determine the one or more symbols of the slot are unused for a threshold duration.
17. The relay device of claim 12 , wherein the one or more processors are operable to cause the relay device to:
identify a slot structure for a second slot of the first subset of resources, wherein the slot structure indicates a set of flexible symbols;
divide the set of flexible symbols into a set of free flexible symbols and a set of non-free flexible symbols; and
transmit an indication of the set of free flexible symbols to the child network node.
18. The relay device of claim 12 , wherein the one or more processors are operable to cause the relay device to:
receive a control message comprising the indication of the direction table.